Comment 6 for bug 415527

Michael Terry >> if you think it's not safe to encrypt with only one public key, duplicity can accept multiple public keys (--encrypt-key key1 --encrypt-key key2 etc...like multiple recipients for email). If Key1 and Key2 are hold by two trustworthy persons located at two distincts places...
If you lost Key1, the Key2 will still be able to decrypt the data.